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Leases - Maturities of lease liabilities (Details) - USD ($) $ in Thousands | Sep. 26, 2019 | Dec. 27, 2018
--- | --- | ---
Operating Leases |  |
2019 (excluding the 39 weeks ended September 26, 2019) | $ 4,649 |
2020 | 25,154 |
2021 | 24,485 |
2022 | 25,056 |
2023 | 23,538 |
2024 and thereafter | 221,983 |
Total lease payments | 324,865 |
Less: amount representing interest | (90,914) |
Total lease liabilities | 233,951 |
Finance Leases |  |
2019 (excluding the 39 weeks ended September 26, 2019) | 1,020 | $ 3,073
2020 | 3,584 | 2,978
2021 | 2,992 | 2,679
2022 | 2,946 | 2,718
2023 | 2,836 | 2,718
2024 and thereafter | 16,948 | 16,940
Total minimum lease payments | 30,326 | 31,106
Less: amount representing interest | (6,248) | (6,978)
Total lease liabilities | $ 24,078 | $ 24,128

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